Configuring the Protect Interface

To configure the protect interface:

1. Select the interface.

   host1(config)#controller sonet 4/1

2. Specify the APS group to which the protect and working interfaces will belong.

   host1(config-controll)#aps group boston

3. Specify the protect interface.

   host1(config-controll)#aps protect

4. (Optional) Prevent the protect interface from taking over automatically if the working interface fails.

   host1(config-controll)#aps lockout

5. (Optional) Enable the router to revert to the working interface when it recovers.

   host1(config-controll)#aps revert 7

6. (Optional) Specify that switchover takes place in unidirectional mode.

   host1(config-controller)#aps unidirectional

aps group

• Use to specify the group to which the working and protect interfaces will belong.
• Specify the name of the APS group.
• Example

  host1(config-controll)#aps group boston

• Use the no version to remove a group of APS interfaces.
• See aps group.

aps lockout

• Use to prevent the protect interface from taking over if the working interface fails.
• You can issue this command only for the protect interface, not for the working interface.
• The aps lockout command has a higher priority than the aps force command, aps manual command, a remote reversion request, a signal failure request, or a signal degradation.
• Optionally, you can specify 0 as the channel number for the protect interface. Because the protect interface is always assigned channel number 0, this is the only valid option.
• The resulting configuration is stored in NVS for SRP module or line module reloads and SNMP.
• Examples

  host1(config-controll)#aps lockout

  host1(config-controll)#aps lockout 0

• Use the no version to restore the default situation, in which the protect interface can take over if the working interface fails.
• See aps lockout.

aps protect

• Use to configure an interface as a protect interface.
• You can issue this command only for the protect interface, not for the working interface.
• Optionally, you can specify 0 as the channel number for the protect interface. Because the protect interface is always assigned channel number 0, this is the only valid option.
• Examples

  host1(config-controll)#aps protect

  host1(config-controll)#aps protect 0

• Use the no version to remove the protect interface from the APS group.
• See aps protect.

aps revert

• Use to revert to the original working interface when it recovers.
• Specify the number of minutes in the range 5–7, after which the router will switch to the working interface.
• You can issue this command only for the protect interface, not for the working interface.
• Example

  host1(config-controll)#aps revert 7

• Use the no version to restore the default setting, in which the router does not revert to the working interface when it recovers.
• See aps revert.

aps unidirectional

• Use to specify that the router should switch to the protect interface using the unidirectional mode switching mechanism.
• You can issue this command only for the protect interface, not for the working interface.
• Example

  host1(config-controller)#aps unidirectional

• Use the no version to restore the default setting, bidirectional mode.
• See aps unidirectional.

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